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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb36fcc35465e4463dce0bb1805ed6ae3fbb68be4868b9106abdb3347a22bd5' 
  AND token = 'eLTMthjC92IPl3Tnu2eHo7weUX5kzKTifqjQADL4N/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}